SOLUTION: My 20% grades are 100, 99, 100, 100, 100, 100 My 80% grades are 39, 100 What is my grade average for the class?

Algebra ->  Average -> SOLUTION: My 20% grades are 100, 99, 100, 100, 100, 100 My 80% grades are 39, 100 What is my grade average for the class?      Log On


   

Question 645535: My 20% grades are 100, 99, 100, 100, 100, 100
My 80% grades are 39, 100
What is my grade average for the class?
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
20% grades:  100, 99, 100, 100, 100, 100 

Find the average of your 20% grades %28100%2B99%2B100%2B100%2B100%2B100%29%2F6 = 599%2F6 = 99.833333

80% grades:   39, 100 

Find the average of your 80% grades %2839%2B100%29%2F2 = 139%2F2 = 69.5

Grade average for class = .20(20% average) + .80(80% average)

Grade average for class = .20(99.833333) + .80(69.5) = 75.166667.

Edwin